Improvement in slide-valves for steam-engines



Z Sheets-Sheet 1.

J. R. KELLY & C. 0. GARDINER. SLIDE VALVE FoRs'rEAM-ENGINE.

Patented Jan.4,1876.

i N. PETERS, PHOTO-LITHOGRAPHEH. WASHINGTON. D C.

A z shee't's-sheet z. J. R. KELLY 2a C. 0. GARDINER.

SLIDE VALVE FoP. STEAM-ENGINE. 4 110,171,819. Patented m14, 187e. r

Foy .5.

N'FEI'ERS. PHOTO-UTHDGRAPHER. WASHINGTON D CV Y TU N'ITED STATES PATENT@EEIGEr JOHN R. KELLY ND CHARLES O. GARDINER, OF SPRINGFIELD, OHIO.

IMPROVEMENT IN SLIDE-.VALVES FOR STEAM-ENGINES.

Specification forming part of Letters Patent No. 17 1,819, dated January4, 1876,; application filer] y November 27, 1875.. i*

To all whom it may concern:

Be it known that we, JOHN R. KELLY `and CHARLES O.GARDINER,ot'Springe1cl, in the county ot' Clarke and State ot' Ohio,have inventedcertain new and useful Improvements in Slide-Valves forSteam-Engines, of which the following is a specification:

Our invention relates to balanced slidevalves; and its object is toregulate the pressure of such valves upon their seats. Various ways andmeans have been devised for attaining this end, one of which is toconnect the back of the valve to the top of the chest by a hinged link;and others again by exposing only a portion of the back ofthe valve tothe action of the steam.

To a certain extent our` invention embodies the latter-mentionedprinciple; and consists, iirst, in providing the steam-chest casing withan extension, the upper surface of which is steam-tight with the coverof the chest, to which is jointed (steam-tight, buthaving slightvertical play) a suitable disk or plate, the face of which titsthe backofthe valve steam-tight, and entirely covers the same, wherebysteampressure upon the back of the valve is prevented, except throughthe medium of said disk, which may expose more or less. surface for thepurpose, as desired; second, in the combination of the steam-chest,anextension thereof provided with a central opening, a pressure disk orplate steam-tight in this extension, and the valve steam-tight with thepressure-disk, said disk being slotted, to permit of the passage of thevalve ears or lugs into the extension-space, to which lugs thevalve-stein is at-b tached, whereby, as this space is steam-free, allpacking of the valve-stem is dispensed with.

In the accompanying drawings, which show y the best ways now known to usof embodying our invention, Figure 1 is a plan or top view of acylindrical steam-chest with its cover removed; Fig. 2, a similar Viewof a rectangular steam-chest; Fig. 2, a vertical central sec` tiontherethrough on the line x :t of Fig. 2. Fig. 3 is a plan or top view ofa cylindrical chest, partly in section, showing. a modification of ourinvention; Fig. 4, a vertical central section therethrough on the lineg/ y ot' Fig. 3; Fig. 5, a view, similar to Fig. 3, of anothermodification; Fig. 6, a vertical central section desiredform-cylindrical, rectangular, or otherwise-hastbrmed or cast with it anextension, B, which' preferably consists of a circular portion,b,with-acentral space or opening, joinedto the casing properby suitablenecks or arms b. The upper face ot' this extension and the cap or coverA nf the steam-chest fit steam-tight. To the under side of thisextension B,'and joined steam-tight therewith, but having slightvertical play, is a pressure disk or plate, U. ot' any desiredconfiguration, with a portion of its surface, more or less, projectinginto the steam-space. In Figs. l, 2, and

2 this joint is shown as consisting of a circu lar upwardly-projecting[lange on the pressure-disk, which closely tits in a correspondinggroove in the circular/portion of the chest-extension. The face of thepressure disk or plate O rests upon the back of the valve D,stea|n(^.tight, and has, in this instance, a slot, c, therei-,\ to permit of thepassage of the valve ears or lugs d, to which the valve-stem E, whichhas its bearings in one of the necks b of the extension B, is connected,in any suitable manner.; (Shown in the present instance as byscrew-threads and nut.)

It Will be obvious, by reason of the steamtight joints, that the spaceF,'occasioned by the peculiar construction of parts described, isentirely steam-free, and that consequently no packing-glands whateverare needed for the valve-stein.

Steam is admitted to the chest inthe usual way, conducting-pipes beingshown in the several figures, and the face of the valve D may be of anyof the ordinary sty les.

In Figs. 3 and 4 we have shown a modification of the pressure-disk O,saiddisk extending up through the central space ot' the steam'- chestextension, and through a packing-ring, a,

itting tightly in an opening in the chest-cover A and in the Lipperportion of the extension.

In Figs. 5 and 6 still another modification of pressure disk or plate isshown, it, however, being the same as that shown in Figs. 3 and 4,except that it does not extend beyond the topof the ring. t

In Fig. 7 a modified form of joint is shown between the chest-extensionand pressure-disk, the extension having depending side Walls, and the`disk upwardly-projecting end walls, or vice versa; and in Figs. 8 and 9otherlmodified forms of joint are shown, which will be ululerstood-fromthe drawing.

Qther forms of pressure disks or plates may be employed, which willsuggest themselves as advantageous lnparticuar instances; and" wepropose, in some cases, to render the disk adjustable, so as to exposemore or less surface to be acted upon in the steam-space, and .wish itto he distinctly understood that We do `not limit ourselves to theprecise construction shown. i For instance, the space in the steanichestextension may be dispensedwith, the presslnedisk being connectedtherewith in `:in y suitable way, and thevalve-stem secured to the valveinthe usual way, and packed by suitable glands. We claim as ourinventionchest-cover, `and has no packing- 'scribed ournames.

plate, and iaving its ears or lugs protruding i through a sl'ot thereininto said extensionspace, whereby, as this space is steam-free', all

packing ot' the valve-stein `isdispen sed with. `In testimony whereof)ve have hereunto sub- JOHN R. KELLY.

p 0. O. GARDINER.

Witnesses: t ,i Y

A. P. LINN COCHRAN,

' RoBT.O. ROGERS.

